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Hundreds of people lined the streets and cheered as he emerged from the Batmobile - driven by an adult Batman - before freeing a damsel who had been tied to cable car tracks.

As she embraced him in thanks, he got a call that the Riddler was trying to rob a vault downtown, so headed to the Financial District and promptly stopped the thief in his tracks.

News cameras captured the moment the Riddler was hauled from the bank and taken away by police officers.

Hold on, damsel in distress! Miles exits the Batmobile with Batman to save a woman after a call from the police chief

We need your help, Batkid! A damsel in distress is tied to tracks in San Francisco by the Riddler

It's up to you, Batkid! Our heroes discuss how to save the woman as they run to her aid

Blammo! The relieved woman hugs her superhero after he saved her from the tracks

Bosh! The damsel in distress did not hold back her thanks

There's not a moment to lose! Batkid and Batman run back to their Batmobile after saving the damsel in distress

After battling his enemy, he headed to Burger Bar to refuel, his Make-A-Wish itinerary explained.

While at Burger Bar, he received get a call on his batphone to go to the window where he saw a huge group of volunteers screaming for Batman’s help - because the Penguin was kidnapping a famous Gotham City mascot - Lou Seal.

Batman and Batkid raced to AT&T park to apprehend the villain and freed Lou Seal, the San Francisco Giants mascot since 1996.

After catching the Penguin, Batkid made his final stop at City Hall, where the Mayor and the Police Chief of Gotham City thanked him and gave him the key to the city.

Uh oh! Batkid then learned that the Riddler had threatened to rob a bank in the Financial District

Kapow! The Riddler is weak to the power of Batman and his sidekick, Batkid, and is promptly arrested

Not so fast! The Riddler is taken away by police after he was dealth with by Batkid

Job done! Crowds cheer as Batkid emerges after helping arrest the Riddler as he stole from the bank

On to the next one! Miles, also known as BatKid, leaves in his Batmobile after arresting the Riddler

'Even superheroes need lunch!' Batkid and Batman head to Union Square to snack on burgers

We love you, Batkid! Make-A-Wish shared this image on Twitter with the caption: 'Batkid, citizens of Gotham need you!'

Batkid was praised for his efforts, with Senator Dianne Feinstein tweeting: 'Thanks for saving Gotham, Batkid!'

Ahead of his heroic efforts, little Miles underwent acrobatic training with his 'Batman', inventor and acrobat Eric Johnston, to prepare him for his big day.

The boy behind the mask: Miles had told the Make A Wish Foundation that he wanted to be Batkid

Johnston and his wife, Sue Graham Johnston, who played the damsel, even created Bat-style gadgets such as a wrist device that played previously recorded messages from San Francisco Police Chief Greg Suhr for Batkid throughout the day.

Johnston said of Batkid: 'He's an excellent superhero because he's a totally mild-mannered kid when the mask is off. But when he puts on the armored Batsuit, he's uncontainable. He shines.'

Around 1,000 special edition 'Gotham City Chronicle' newspapers will be handed out at Union Square today, with the headline: 'Batkid saves city.'

And even the illustrators for the original Batman are involved, after Andrew Farago, curator of the Cartoon Art Museum in San Francisco, reached out to cartoonists and DC Comics.

Graham Nolan, who drew the Batman series through the 1990s and co-created of the villain, Bane, was the first to respond - and sent through a drawing showing Miles as Batkid fighting Bane.

Nolan signed it: 'For Miles, a real superhero!'

'We certainly all were children who had dreams of being a superhero and being larger than life,' Farago told the Mercury News.

'But I think this has touched people because most of us have never had to overcome the obstacles that this boy has.'

While the day of saving damsels in distress and capturing the Riddler will no doubt be great fun for Miles, it is also an important day for his family.

Batkid! The caped crusader contemplates his next move in the Batmobile

Batkid! The hero of the day rushes to his next task

Batkid! The crowd cheers in San Francisco

Fans: A San Francisco Police Officer with a Batkid sign on his bike, left, waits for the arrival of the superhero, while a young fan holds a sign expressing her thanks from her father's shoulders, right

Thanks, Robin! Miles is cheered on by his little brother, who is dressed as Robin, and his grandmother

Let's go! Police escort batkid after in Union Square after his heroic deeds

Holy cow! The adventures of Batkid continue

Da-anananana! A San Francisco police officer on bike escorts BatKid after he arrested the Riddler

'This wish has meant closure for our family and an end to over three years of putting toxic drugs in our son's body,' said his mother Natalie, the San Jose Mercury News reported.

The Make-A-Wish Foundation grants the wishes of children with life-threatening medical conditions to give them hope.

Other incredible wishes it has granted include Justin Bieber meeting eight-year-old Annalysha Brown-Rafanan, who suffers from a life-threatening liver condition, and 11-year-old Tyler Sue, who has a serious genetic condition, meeting her 'Cake Boss' idol, Buddy Valastro.